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Old 11-29-2001, 08:43 AM   #1
Scooby Newbie
Member#: 1031
Join Date: Mar 2000
Location: PA, USA
2002 WRX

Default Misfires- P0301 P0302 P0303 P0304

I would like to share this info with you since you have replied to my numerous e-mails with very good technical info!!
I got a unichip from you a month ago and have been haveing problems with the car since , they have been getting progressivly worse. It had boost spiking like others in the i-club have reported. No matter what i did I couldn't stop it. the car seemed to run strong, until reciently.
I had changed the silicone (jelly) hose that you sent with a rubber vaccuume hose with no noticable difference in the boost spiking.
I have a KN air/fuel meter. The kind with 9 LEDs . It was displaying like a christmas trees blinking lights. then the car started runningn really ****ty through a week or so and then check engine lights started being displayed. they were p0302
misfire in cylinder 2 ..
I finally put the car back to stock and took it to the dealer. They said it had a loose wire on the coil. I never had my hand down near that ever.
I see alot of people reporting misfires on i-club. I know I had them and didn't get a check engine light.
Now since its fixed I put the unichip back in and the boost spiking is fixed, everything is nice and smooth. Unichip works great!! The air/fuel guage is now lighting across the scale like your dinning room light would with a dimmer switch vs the blinking xmas tree..
My feeling is that unburned fuel entering the exaust, because of a undetected misfire, is then igniting and causing the turbo to spool eratically and causing the spikes.
I believe everyone should check their ignition wires to the coils for good contact, it could become a recall???
I know that the rally cars squirt in fuel into the exaust to keep the turbo spoold when they let off the gas to shift at the cost of longevity to the turbo. I believe something simular is happening with a misfire causing the turbo to over spool eratically resulting in the boost spikes
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Last edited by AndyHidley; 11-29-2001 at 08:49 AM.
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Old 11-29-2001, 12:43 PM   #2
Scooby Guru
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
'01 GC8 Dinged STM
'09 Concours 14 ABS Black


u were running anti lag unintentationally....actually the cylinder was probably partially firing as opposed to totally firing....and a partial fire is enough to dump raw fuel in the exhaust. Talk about boost spikes.

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Old 11-30-2001, 12:41 AM   #3
Scooby Specialist
Member#: 10823
Join Date: Oct 2001
Location: Burlington, Ontario
2007 STi


Thanks for the very usefull feedback... Any 'better checks' are always a good thing!
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Old 11-30-2001, 01:18 AM   #4
Scooby Specialist
Member#: 4324
Join Date: Feb 2001
Location: (925) CA
02 GDA


ill check the coil harness' to see if mine arent contacting properly, that might be the reason for misifire in all cylinders.


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